Although it may be a common assumption that house cats purr when they are experiencing comfort, domestic cat owners may find themselves perplexed when they realize that their cat not only purrs while being pet, but during times of extreme stress such as being severely frightened, ill, or even while giving birth.
So why do cats purr in these other states that seemingly involve moments of stress and pain? First, it might be interesting to consider the theories behind where the physical act of purring originates.
The Physiology of a Cat's Purr
First of all there seems to be basically two theories as to where a cat's purring is physically produced.
The most popular theory, promoted by Veterinarian Neils C. Pederson in his book Feline Husbandry for example, suggests that purring occurs when certain nerves are activated within the voice box of a cat; thereby originating from the central nervous system as a voluntary act.
The other theory suggests that a cat's purring comes from vibrating blood vessels as opposed to the voice box.
Although scientists may debate the manner in which a cat's purr is physically produced; studies regarding the results of the physical act appear to be less debatable. Studies have shown that domestic cats' purring is produced consistently at a pattern between 25 and 150 Hertz. And the same studies have shown that a frequency within this range can improve bone density and promote healing.
Mythology Behind Cats' Nine Lives
Mythology, and a common legend held among vets, suggests that a cat is able to reassemble its bones when placed in a room with all of its parts. Like any aspect of mythology, this one might require some facts in order to properly assimilate the meaning of such a statement.
The domestication and breeding of cats, as opposed to their canid counterpart like dogs, has occurred relatively more recently which may have left their bones and muscles lacking the capacity and strength that their counterparts have developed over time. And purring may very well be a low energy mechanism cats have developed in order to stimulate bone growth and healing.
Remarkable Aspects of Cats
Two interesting facts to consider regarding domestic cats and their remarkable ability to 'bounce back' may be in order: although a cat cannot meow and nurse at the same time, a cat can purr and nurse at the same time; and, purring apparently does not seem to be a learned behavior as kittens start purring within a day or two of birth.
Sources:
The Cat's Mind, by Bruce Fogle
Feline Husbandry, by Neils C. Pederson
Michael Ashworth - I grew up expressing myself mostly on the soccer field and ended up playing Division 1 in College. In College I found joy in my English ...
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